CN114761585A - Heat treatment apparatus - Google Patents
Heat treatment apparatus Download PDFInfo
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- CN114761585A CN114761585A CN202080083926.5A CN202080083926A CN114761585A CN 114761585 A CN114761585 A CN 114761585A CN 202080083926 A CN202080083926 A CN 202080083926A CN 114761585 A CN114761585 A CN 114761585A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 136
- 229910052751 metal Inorganic materials 0.000 claims abstract description 94
- 239000002184 metal Substances 0.000 claims abstract description 94
- 238000000137 annealing Methods 0.000 claims abstract description 48
- 239000011810 insulating material Substances 0.000 claims abstract description 46
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 22
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 20
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 20
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 20
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 88
- 239000000463 material Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 230000001105 regulatory effect Effects 0.000 description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- 239000011651 chromium Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000033116 oxidation-reduction process Effects 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Furnace Details (AREA)
- Tunnel Furnaces (AREA)
Abstract
The utility model provides a method for suppressing SiO contained even in a reducing atmosphere2The heat treatment apparatus for bright annealing a metal strip, which is a deteriorated heat insulating material made of ceramic fibers. The heat treatment device (1) is provided with a heating belt (12) for heating the metal belt (3), is used as the furnace inner wall of the heating belt (12), and comprises SiO2And a gas supply unit (9,28,28a) for supplying a reducing gas to the heating belt (12) so that the dew point is maintained at an upper limit dew point at which the metal belt (3) can have brightness and at which SiO contained in the heat insulating material (17) is not caused2Reduced lower dew pointIn a reducing atmosphere, the metal strip (3) is bright annealed.
Description
Technical Field
The utility model relates to a heat treatment device for bright annealing of metal strips.
Background
In order to remove internal stress of a metal strip generated by cold rolling, a heat treatment apparatus is known which performs bright annealing of the metal strip in a reducing atmosphere.
Documents of the prior art
Patent document
Patent document 1: japanese examined patent publication (Kokoku) No. 03-1472
Patent document 2: japanese patent No. 4268281
Patent document 3: japanese patent laid-open No. 2003-201595
Disclosure of Invention
Technical problems to be solved by the utility model
In patent document 1, since the muffle structure of the furnace body is made of a steel plate, deformation occurs by heating at high temperature. In particular, in the case of a horizontal furnace, since the section of the furnace top made of a steel plate is long, the furnace top sags due to its own weight, the shape is largely deformed, turbulence is generated in the gas flow in the furnace, and the temperature distribution in the furnace is poor. In patent document 2, although the refractory bricks are not easily deformed, the weight of the refractory bricks is heavy, and therefore, workability in assembling, maintenance, and replacement is poor, and the annealing furnace is heavy, and therefore, it is necessary to install the annealing furnace at a place having load resistance.
Accordingly, the technical problem of the present invention is to provide a method for suppressing SiO contained even in a reducing atmosphere2The heat treatment apparatus for bright annealing a metal strip, which is a deteriorated heat insulating material made of ceramic fibers.
Technical scheme for solving technical problem
In order to solve the above-described problems, a heat treatment apparatus according to an embodiment of the present invention includes: comprises a heating belt for heating a metal belt, a furnace inner wall used as the heating belt and made of SiO2And a gas supply unit for supplying a reducing gas to the heating belt so that a dew point is maintained at an upper limit dew point at which the metal belt can have brightness and so that the SiO contained in the heat insulating material is not caused2The condition between the lower dew point of the reduction, bright annealing the metal strip in a reducing atmosphere.
In order to solve the above-described problems, a heat treatment apparatus according to an embodiment of the present invention is a heat treatment apparatus for bright annealing a metal strip in a reducing atmosphere, the heat treatment apparatus including: a furnace body having a heating belt for heating the metal belt and a cooling belt provided on a downstream side of the heating belt in a conveying direction of the metal belt; a heat insulating material used as the inner wall of the heating belt and containing SiO2The ceramic fiber of (2); a gas supply unit for supplying a reducing gas into the furnace body; measuring the heating tapeA dew point measuring part for the dew point of the atmosphere; and a dew point adjusting unit for adjusting the dew point so that the dew point is maintained at an upper limit dew point at which the metal strip can be brightly maintained and at which the SiO contained in the heat insulating material is not caused to be maintained, the dew point adjusting unit being controlled based on the dew point measured by the dew point measuring unit2Between the lower dew points of reduction.
Effects of the utility model
Although the oxidation of the surface of the metal strip can be suppressed as the moisture in the atmosphere in the furnace is reduced, and the brightness of the metal strip is more advantageous, when a lightweight ceramic fiber is used as the heat insulating material for the inner wall of the furnace, the SiO contained in the heat insulating material is used2The reduction direction is active and therefore disadvantageous for the insulation material. Therefore, the present inventors have focused on the existence of a technique capable of simultaneously achieving the maintenance of brightness and the prevention of SiO2The dew point (i.e., the amount of moisture) in an appropriate range for the reduction, and the present invention has been accomplished.
According to the present invention, by maintaining the dew point (i.e., the moisture amount) of the atmosphere in the heating zone between the upper limit dew point and the lower limit dew point, the moisture amount in the reducing atmosphere is suitable for maintaining the brightness of the metal strip and preventing SiO contained in the heat insulating material2And (4) reducing. As a result, the metal strip can be provided with brightness and prevented from being affected by SiO contained in the heat insulating material2Degradation of the insulating material due to the reduction of (2).
Drawings
Fig. 1 is a schematic sectional view of a heat treatment apparatus of a first embodiment.
Fig. 2 is a diagram schematically illustrating the relationship between the temperature and the dew point of the atmosphere.
Fig. 3 is a diagram schematically illustrating the relationship between the temperature and the dew point of the atmosphere.
Fig. 4 is a schematic cross-sectional view of a heat treatment apparatus according to another embodiment of the first embodiment.
Fig. 5 is a schematic sectional view of a heat treatment apparatus of a second embodiment.
FIG. 6 is a schematic cross-sectional view of a heat treatment apparatus according to another embodiment of the second embodiment.
Detailed Description
Hereinafter, an embodiment of the heat treatment apparatus 1 according to the present invention will be described with reference to the drawings.
[ first embodiment ]
Referring to fig. 1, a heat treatment apparatus 1 according to a first embodiment is described. Fig. 1 is a schematic sectional view of a heat treatment apparatus 1 of a first embodiment.
As shown in fig. 1, a bright annealing furnace (heat treatment apparatus) 1 for continuously performing bright annealing on a metal strip 3 includes a furnace body 10, gas supply units 9 and 28, a dew point measuring unit 22, dew point adjusting units 24 and 27, and a control unit 20. A bright annealing furnace (heat treatment apparatus) 1 shown in fig. 1 is a horizontal furnace in which a furnace body extends in a lateral direction (horizontal direction). In the horizontal furnace, a conveying mechanism for conveying the metal strip 3 can be simplified, and the height of the heat treatment apparatus 1 can be prevented from increasing.
In fig. 1, the metal strip 3 is conveyed horizontally from left to right. The metal belt 3 is formed of, for example, a stainless steel material containing Cr. The stainless steel material containing Cr is, for example, austenitic stainless steel SUS304 or ferritic stainless steel SUS 430.
The furnace body 10 is formed of a steel box, and has a heating zone 12 and a cooling zone 14. The heating belt 12 extends in the lateral direction (horizontal direction) and is provided on the upstream side in the conveying direction of the metal belt 3 (the entrance side of the metal belt 3). The heating belt 12 is heated by a heating section 16. The heating portion 16 is, for example, an electrothermal heater. The control unit 20 controls the heating belt 12 to a predetermined annealing temperature (here, the temperature in the heating step in the annealing and the temperature in the heating step in the cooling step) based on the temperature measured by the temperature measuring unit (not shown). The annealing temperature in the present application refers to the furnace atmosphere temperature in the heating belt 12. For example, in the case of a general stainless steel material, the annealing temperature suitable for the bright annealing is in a temperature range of 800 ℃ to 1250 ℃, and the control section 20 controls the heating section 16 so that the annealing temperature falls within the above temperature range.
The cooling belt 14 is provided on the downstream side in the conveying direction of the metal strip 3 (the exit side of the metal strip 3). Since the cooling zone 14 is annealed, cooling is mainly performed by cooling, and thus, no heating device or heat insulating material 17 is provided. However, the cooling belt 14 may be provided with some cooling means as the case may be.
On the inner surface (furnace inner wall) of the furnace wall such as the side wall, the furnace ceiling, and the furnace bottom of the furnace body 10, a heat insulating material 17 is attached. The heat insulating material 17 is made of SiO2The ceramic fiber of (2). The heat insulating material 17 may be configured to be held by piercing a large number of rod-shaped studs attached to the furnace wall with a plate or felt made of ceramic fibers and pressing the studs with a washer-shaped metal fitting, for example. The heat insulating material 17 is Al2O3(alumina) and SiO2Fibers based on (silica), e.g. Al2O3Is 30 to 60 mass% and SiO 240 to 70 mass% of alumina-silica ceramic fiber.
The inside of the furnace body 10 of the bright annealing furnace 1 is filled with a reducing atmosphere gas. An inlet seal roller 13 and an outlet seal roller 15 are provided at the inlet opening and the outlet opening of the furnace body 10, respectively. The inlet seal roll 13 and the outlet seal roll 15 prevent the outside air from entering the furnace body 10 by maintaining the inside of the furnace body 10 at a pressure slightly higher than the atmospheric pressure. However, even if the metal belt 3 is sandwiched between the entrance seal roll 13 and the exit seal roll 15, a slight amount of moisture is brought into the furnace body 10 from the outside air in a state of adhering to the surface of the metal belt 3 at the entrance seal roll 13. In the outlet seal roller 15, a slight amount of atmospheric gas flows out of the furnace in the same manner. Therefore, it is necessary to constantly measure and adjust the dew point (moisture content) of the atmosphere in the heating zone 12.
The gas supply unit includes a gas supply device 9 and a second control valve 28, and supplies the reducing gas into the furnace body 10, in other words, the heating zone 12, through the gas supply line 5. The gas supply device 9 is, for example, a gas cylinder. The reducing gas is a gas containing hydrogen, for example, a gas in which hydrogen and nitrogen are mixed at a ratio of 3: 1. The amount of reducing gas supplied can be controlled by adjusting the opening of the second regulating valve 28 provided in the gas supply line 5. The opening degree of the second regulator valve 28 is controlled by the control unit 20. By supplying the reducing gas, the amount of leakage from the inlet seal roll 13 and the outlet seal roll 15 can be replenished. In the bright annealing furnace 1 shown in fig. 1, the gas supply line 5 is disposed upstream of the cooling zone 14, but the supply position of the reducing gas is not particularly limited. The reducing gas supplied from the gas supply line 5 is diffused as an atmospheric gas throughout the inside of the furnace body 10 including the heating zone 12, and is then discharged to the outside of the furnace body 10.
Conventionally, the reducing gas supplied from the gas supply device 9 is a gas having a low dew point (i.e., a low water content), for example, a JIS hydrogen class 1 gas having a dew point of-70 ℃. Therefore, in the present application, since the dew point adjusting unit 24 including the dehumidifying device 25 or the humidifying device 26 can adjust the dew point of the furnace atmosphere, the reducing gas supplied from the gas supplying device 9 does not need to be a low dew point (i.e., a low water content). That is, as the reducing gas supplied from the gas supply device 9, a gas containing a larger amount of water than that of the conventional JIS hydrogen grade 1 can be used, and for example, a gas corresponding to JIS hydrogen grade 2 and having a dew point of-60 ℃ can be used.
The dew-point measuring unit 22 measures the dew point of the atmosphere (hereinafter, sometimes referred to as "atmosphere gas") in the heating zone 12 of the furnace body 10 through the dew-point measuring duct 6. The dew point measuring unit 22 is, for example, a capacitance type dew point meter or a mirror cooling type dew point meter. The measured data of the dew point is sent to the control unit 20 and stored in the storage unit of the control unit 20. In the bright annealing furnace 1 shown in fig. 1, the dew point measuring duct 6 is disposed downstream of the heating zone 12, but the measuring position of the dew point is not particularly limited.
The dew point adjusting unit includes a dew point adjusting device 24 and a first regulating valve 27, and adjusts the dew point of the atmosphere in the heating belt 12. The dew point adjusting device 24 includes at least one of a dehumidifying device 25 and a humidifying device 26. Thus, the dew point of the atmosphere in the heating zone 12 can be appropriately adjusted based on the dew points of the reducing gas and the target atmosphere supplied from the gas supply units 9 and 28.
The dew point adjusting device 24 extracts a part of the atmosphere through the inlet-side duct 7 provided on the upstream side in the conveying direction of the heating belt 12, adjusts the dew point of the extracted atmosphere, that is, the moisture content, and returns the adjusted atmosphere to the furnace body 10 through the outlet-side duct 8 provided on the downstream side in the conveying direction of the heating belt 12. The atmosphere gas circulates between the dew point adjusting device 24 and the furnace body 10, and the dew point of the atmosphere in the heating zone 12 is maintained at a predetermined dew point.
The dew point adjusting device 24 (i.e., the dehumidifying device 25 and the humidifying device 26) is controlled by the control unit 20. The circulation amount of the atmosphere gas can be controlled by adjusting the opening degree of the first adjustment valve 27 provided in the inlet-side duct 7. The opening degree of the first regulator valve 27 is controlled by the control unit 20.
The dehumidifying device 25 has a function of removing moisture contained in the atmosphere (dehumidifying the atmosphere) and reducing the dew point of the atmosphere. The dehumidifying apparatus 25 has, for example, an adsorption tower and a separation tower filled with an adsorbent. The adsorbent is synthetic zeolite such as molecular sieve (molecular sieve), natural zeolite, activated carbon, silica gel, alumina, activated alumina, etc. Dehumidification using an adsorbent makes it easy to control the dew point of the dehumidified atmosphere to a predetermined dew point, and the resulting atmosphere is very clean.
The humidifying device 26 has a function of generating a moisture-containing gas obtained by mixing water vapor or liquid-phase water with the atmosphere, and feeding the moisture-containing gas into the furnace body 10 to add moisture to the atmosphere (humidifying the atmosphere) and raise the dew point of the atmosphere. The humidifying device 26 is, for example, a bubbling type in which the atmosphere is passed through water stored in a container, a spray nozzle type in which water vapor is sprayed in a mist form with respect to the atmosphere, a membrane exchange type using a hollow fiber membrane having high water vapor permeability, or the like.
The control unit 20 is electrically connected to the dew point measuring unit 22, the dew point adjusting device 24, the first adjusting valve 27, the second adjusting valve 28, and the heating unit 16. The control unit 20 may be configured using a computer or the like including a calculation unit such as a CPU (central processing unit), and a storage unit such as a RAM (random access memory) and a ROM (read only memory).
The control unit 20 controls the gas supply units 9 and 28 and the dew point adjustment units 24 and 27 based on the dew point measured by the dew point measuring unit 22. That is, the controller 20 controls the opening degree of the second regulating valve 28 to control the supply amount of the reducing gas supplied from the gas supply device 9. The control unit 20 controls the opening degree of the first regulating valve 27 to control the circulation amount of the atmosphere gas by the dew point adjusting device 24. Thereby, automation of bright annealing (heat treatment) can be realized.
The control unit 20 controls the operation of the dehumidifying device 25 or the humidifying device 26 in the dew point adjusting device 24. When the dehumidifier 25 is operated, the control unit 20 removes moisture contained in the atmosphere, thereby lowering the dew point of the atmosphere, i.e., the moisture content. When the control unit 20 controls the humidifier 26 to operate, the moisture content contained in the atmosphere is increased, thereby increasing the dew point of the atmosphere, i.e., the moisture content. Thereby, automation of bright annealing (heat treatment) can be realized.
[ other aspects of the first embodiment ]
As described above, even if the sealing structure in which the metal strip 3 is sandwiched by the entrance seal rollers 13 is adopted, a slight amount of moisture is taken into the furnace body 10 from the outside air in a state of adhering to the surface of the metal strip 3, and thus the dew point (moisture amount) of the atmosphere rises. Therefore, by using hydrogen gas having an extremely low dew point as the reducing gas, the moisture contained in the atmosphere can be diluted and the dew point of the atmosphere can be reduced. Further, even if hydrogen gas having an extremely low dew point is used as the reducing gas, the dew point of the atmosphere can be increased by reducing the flow rate of the reducing gas by the second regulating valve 28. Further, when a slight amount of moisture is prevented from being taken into the furnace body 10 from the outside air by some means, the moisture contained in the atmosphere can be increased by using hydrogen gas having a slightly higher dew point as the reducing gas, and the dew point of the atmosphere can be increased.
Therefore, the dew point of the atmosphere in the heating zone 12 can be adjusted without using the dehumidifying device 25 or the humidifying device 26 shown in fig. 1. That is, as shown in fig. 4, the control unit 20 controls the second control valve 28 based on the dew point of the atmosphere measured by the dew point measuring unit 22, thereby adjusting the flow rate of the reducing gas supplied from the gas supply device 9, and thus adjusting the dew point of the atmosphere in the furnace body 10 including the heating zone 12. Thereby, automation of bright annealing (heat treatment) can be realized. Here, depending on the amount of moisture taken into the furnace body 10 from the outside air, hydrogen gas having an extremely low dew point or hydrogen gas having a slightly high dew point can be used as the reducing gas supplied from the gas supply device 9. Thereby, the gas supply device 9 and the second regulating valve 28 function as the dew point adjusting device 24 a. Thus, the dew point adjusting device 24a can be constituted by a simple configuration.
[ control of dew Point of atmosphere ]
As described above, the oxidation of the surface of the metal strip 3 is suppressed as the moisture in the atmosphere in the heating zone 12 of the furnace body 10 is smaller, and therefore, the brightness of the metal strip 3 is more advantageous, but the SiO contained in the heat insulating material 17 is used to reduce the amount of moisture contained in the metal strip 32The reduction direction is active and therefore disadvantageous to the thermal insulation material 17. Therefore, the present inventors have focused on the existence of a technique capable of simultaneously achieving the maintenance of brightness and the prevention of SiO2The dew point (i.e., moisture content) in an appropriate range for reduction, and the present invention has been accomplished.
The control of the dew point of the atmosphere in the heating belt 12 is explained with reference to fig. 2. Fig. 2 is a diagram schematically illustrating the relationship between the temperature and the dew point of the atmosphere. In FIG. 2, the horizontal axis represents the annealing temperature and SiO in the heating zone 122The vertical axis represents the dew point of the atmosphere in the heating zone 12. In FIG. 2, A is a straight line showing a dew point at-30 ℃ and S is SiO2Oxidation-reduction equilibrium curve of (a). SiO when the dew point is higher than the equilibrium curve S2When the dew point is lower than the equilibrium curve S after being oxidized, SiO2Is reduced. In addition, the intersections of the straight line A with the annealing temperatures of 800 ℃ and 1250 ℃ are a and b, respectively, and the intersections of the equilibrium curve S with the equilibrium temperatures of 800 ℃ and 1250 ℃ are c and d, respectively. These temperatures and intersections correspond, for example, to annealing of stainless steel materials.
The dew point of the atmosphere corresponds to the amount of moisture contained in the atmosphere. For example, the dew point is-30 ℃ and the water content is about 338 (g/m)3) The dew point thereof was-35 ℃ and the water content thereof was about 203 (g/m)3) The dew point of the water content was-40 ℃ and the water content was 119 (g/m)3) The dew point of-45 ℃ is about 68 (g/m)3) The dew point of the water content is-50 ℃ and the water content is about 38 (g/m)3) The dew point of the water content was-55 ℃ and the water content was about 21 (g/m)3) The dew point thereof was-60 ℃ and the water content thereof was about 11 (g/m)3) The dew point thereof was-65 ℃ and the water content thereof was about 5.6 (g/m)3) The dew point thereof was-70 ℃ and the water content thereof was about 2.7 (g/m)3). Thus, as the dew point of the atmosphere decreases, the atmosphere becomes saturated with waterThe water content is reduced.
When the surface of the metal strip 3 is oxidized, an oxide film is formed on the surface of the metal strip 3. When the metal belt 3 is a stainless steel material containing Cr, an oxide film in which Cr and Fe are oxidized is formed. It is said that, in order to suppress surface oxidation of the metal strip 3, it is desirable that the dew point of the atmosphere is as low as possible, that is, the moisture content of the moisture contained in the atmosphere is as low as possible.
However, in the actual heat treatment process, it is found that when the thickness of the oxide film formed on the surface of the metal strip 3 becomes thinner than a certain thickness, the influence on the brightness of the metal strip 3 is reduced. Therefore, by setting the upper dew point of the atmosphere to-30 ℃ or lower, the formation of an oxide film in the metal strip 3 can be suppressed, and the metal strip 3 has a certain level or higher of brightness and hardly causes any product problems. The line a in fig. 2 represents the maximum upper dew point at which the formation of the oxide film in the metal strip 3 is suppressed. The intersection point a is the maximum upper dew point at 800 ℃ and the intersection point b is the maximum upper dew point at 1250 ℃.
When the metal strip 3 made of a stainless steel material having a glittering property is commercialized, it is preferable to adjust the upper limit dew point of the atmosphere to-30 ℃ or lower. In order to obtain a metal strip 3 having a higher degree of brightness in the stainless steel material, the upper dew point of the atmosphere may be adjusted to-45 ℃ or lower. In order to obtain a metal strip 3 having a higher degree of brightness, the upper dew point of the atmosphere may be adjusted to-65 ℃ (line X in the figure) or less. Therefore, in the stainless steel material, the upper limit dew point at which the metal strip 3 can be made bright is set to a range of-30 ℃ to-65 ℃ depending on the degree of the brightness of the metal strip 3 to be bright-annealed. With this configuration, the metal strip 3 having a desired brightness can be obtained.
A heat insulating material 17 made of ceramic fiber is provided on the inner surface (inner wall) of the furnace wall. Conventionally, in the horizontal bright annealing furnace 1, a high-purity Al-containing material having an arch-shaped laminated structure is used2O3In the case of high-purity alumina-based refractory bricks (alumina), there is a problem that dust is generated and the quality of the metal strip 3 is deteriorated due to expansion and contraction of the refractory bricks when the temperature in the furnace is increased or decreased.
In the horizontal bright annealing furnace 1 of the present application, SiO is contained by using2The ceramic fiber of (3) is used as the heat insulating material 17, and can suppress the generation of dust and obtain a high-quality metal belt 3. However, SiO contained in the ceramic fiber2Reduction resistance ratio of Al2O3(alumina) is low, and when ceramic fibers are used in a highly reducing atmosphere, it is believed that SiO is responsible2The ceramic fibers deteriorate and become brittle, and dust is generated.
In the present invention, the present inventors have focused on SiO2So that SiO is contained2The heat insulating material 17 made of the ceramic fiber of (3) can be used in a highly reducing atmosphere. As shown in FIG. 2, with SiO2Is bounded by an oxidation-reduction equilibrium curve S, the upper side of which is SiO2In the region where the oxidation state is maintained, SiO is located below the equilibrium curve S2A reduced region.
SiO2The dew point at the intersection point c of the oxidation-reduction equilibrium curve S with the equilibrium temperature of 800 ℃ is about-95 ℃ and the dew point at the intersection point d with the equilibrium temperature of 1250 ℃ is about-60 ℃. The dew point is set to a temperature which does not cause SiO contained in the heat insulating material 17 to be present at an equilibrium temperature of 800 to 1250 ℃ suitable for bright annealing of a stainless steel material2Lower reduced dew point. Therefore, when the annealing temperature of the heating belt 12 is in the range of 800 to 1250 ℃, the control unit 20 can control the atmosphere dew point not to be lower than the equilibrium curve S, thereby preventing SiO from being generated2And (4) reducing. This prevents the generation of dust due to the deterioration of the heat insulating material 17 made of ceramic fibers, and thus a high-quality metal belt 3 can be obtained.
When the annealing temperature of the heating belt 12 is 800 to 1250 ℃ (for example, when the metal belt 3 is made of stainless steel material), the control unit 20 controls the dew point adjusting units 24 and 27 so that the dew point of the atmosphere is maintained in the region surrounded by the intersection points a, b, d, and c in fig. 2. Thereby, the metal band 3 can be provided with brightness, and SiO contained in the heat insulating material 17 can be prevented2And deterioration of the insulating material 17 due to the reduction.
[ second embodiment ]
Referring to fig. 5, a heat treatment apparatus 1 according to a second embodiment is described. Fig. 5 is a schematic sectional view of the heat treatment apparatus 1 of the second embodiment.
As shown in fig. 5, the bright annealing furnace (heat treatment apparatus) 1 of the second embodiment includes a furnace body 10, a gas supply unit 9, a dew point measuring unit 22, and dew point adjusting units 24,27a, and 28 a. In comparison with the bright annealing furnace (heat treatment apparatus) 1 of the first embodiment shown in fig. 1, the bright annealing furnace (heat treatment apparatus) 1 of the second embodiment omits a control unit 20 such as a computer. Therefore, an operator who operates the bright annealing furnace (heat treatment apparatus) 1 is an alternative to the control unit 20.
The operator can manually control at least one of the second regulating valve (dew point adjusting unit) 28a and the first regulating valve (dew point adjusting unit) 27a based on the dew point measured by the dew point measuring unit 22. That is, the operator can visually acquire the dew point measured by the dew point measuring unit 22 through a monitor or the like. Further, the operator can control the supply amount of the reducing gas supplied from the gas supply device 9 by manually controlling the second control valve (dew point adjusting portion) 28a based on the measured dew point. Further, the operator controls the first adjustment valve (dew point adjustment unit) 27a based on the measured dew point, thereby controlling the circulation amount of the atmosphere gas by the dew point adjustment device 24.
Further, the operator performs control so as to operate the dehumidifying device 25 in the dew point adjusting device 24, thereby removing moisture contained in the atmosphere and lowering the dew point of the atmosphere, that is, the moisture amount. Further, the operator controls the humidifying device 26 of the dew point adjusting device 24 to operate, so that the moisture contained in the atmosphere increases, and the dew point of the atmosphere, that is, the moisture amount, increases.
Thus, by maintaining the dew point (i.e., the moisture content) of the atmosphere in the heating zone 12 between the upper limit dew point and the lower limit dew point, the moisture content in the reducing atmosphere is suitable for maintaining the brightness of the metal strip 3 and preventing SiO contained in the heat insulating material 172And (4) reducing. As a result, the metal tape 3 can be provided with glittering property, and the SiO contained in the heat insulating material 17 can be prevented from being generated2Caused by reduction ofThe deterioration of the heat insulating material 17.
[ other aspects of the second embodiment ]
As shown in fig. 6, the dew point adjusting device 24 (the dehumidifying device 25 and the humidifying device 26) may be omitted in addition to the control unit 20, and the gas supply device 9 and the second regulating valve (the dew point adjusting unit) 28a may be used as the dew point adjusting device 24 a. This makes it possible to easily configure the dew point adjusting device 24 a. The operator can control the dew point adjusting device 24a based on the dew point of the atmosphere measured by the dew point measuring unit 22. That is, the operator can visually acquire the dew point measured by the dew point measuring unit 22 through a monitor or the like. Further, the operator manually controls the second regulating valve (dew point adjusting unit) 28a based on the measured dew point, thereby controlling the flow rate of the reducing gas supplied from the gas supply device 9.
Thus, by maintaining the dew point (i.e., the moisture content) of the atmosphere in the heating zone 12 between the upper limit dew point and the lower limit dew point, the moisture content in the reducing atmosphere is suitable for maintaining the brightness of the metal belt 3 and preventing SiO contained in the heat insulating material 172And (4) reducing. As a result, the metal tape 3 can be provided with glittering property, and the SiO contained in the heat insulating material 17 can be prevented from being generated2And degradation of the insulating material 17 due to the reduction.
The manual control in the second embodiment does not require the operator to constantly perform the control, and includes a case where the operator occasionally or periodically monitors the dew point, and if there is no abnormality, the operator does not perform any special control.
The present invention is not limited to the above embodiments and numerical values, and various modifications can be made within the scope of the present invention.
The operator may perform at least one of the following operations in place of the control section 20: the dew point measured by the dew point measuring unit 22 is acquired, and the dew point adjusting units 27a,28a are controlled so that the dew point is maintained between the upper limit dew point and the lower limit dew point based on the dew point measured by the dew point measuring unit 22.
The bright annealing furnace (heat treatment apparatus) 1 may be a vertical furnace in which the furnace body 10 extends in the longitudinal direction (vertical direction).
In the bright annealing furnace (heat treatment apparatus) 1, an entrance seal tape may be provided on the upstream side in the conveying direction of the heating belt 12, and the entrance seal roll 13 may be disposed in the entrance seal tape. An outlet seal tape may be provided on the downstream side in the conveying direction of the cooling belt 14, and the outlet seal roller 15 may be disposed in the outlet seal tape. The heating zone 12 may be composed of an entrance seal zone, a preheating zone, a soaking zone (none of which is shown), and the like. The cooling zone 14 may be composed of an outlet seal zone, a quench zone, a slow cooling zone (none of which are shown), and the like.
The bright annealing furnace 1 shown in fig. 1 includes both the dehumidifying device 25 and the humidifying device 26, but may be configured to include either the dehumidifying device 25 or the humidifying device 26.
FIG. 3 shows Cr obtained by oxidizing the Cr component in a stainless steel material2O3Oxidation-reduction equilibrium curve C for (chromium oxide). Although the above embodiment has been described with the upper limit dew point of-30 ℃, it is considered that the dew point of the atmosphere is controlled so as not to exceed Cr2O3The oxidation-reduction equilibrium curve C of (a) can also prevent oxidation of the stainless steel material. Therefore, in the case of a stainless material, the control section 20 may control the dew point adjusting sections 24,24a so that the dew point of the atmosphere is maintained within the region surrounded by the intersection points e, f, d, and c in fig. 3.
The metal strip 3 subjected to the bright annealing in the reducing atmosphere can be applied to various metal materials such as a pure metal such as nickel, titanium, or copper, a low expansion alloy, a magnetic alloy, a heat resistant alloy, or a corrosion resistant alloy, in addition to the above-described stainless steel material.
The utility model and embodiments can be summarized as follows.
The heat treatment apparatus 1 according to an embodiment of the present invention is characterized in that: comprises a heating belt 12 for heating the metal belt 3, and a SiO-containing material used as the inner wall of the heating belt 122And a gas supply part 9,28,28a for supplying a reducing gas to the heating belt 12 so that a dew point is maintained at an upper limit dew point at which the metal belt 3 can have brightness and so that the SiO contained in the heat insulating material 17 is not caused2The metal strip 3 is bright annealed in a reducing atmosphere at a condition between the lower dew points of the reduction.
According to the above configuration, by maintaining the dew point (i.e., the moisture content) of the atmosphere in the heating zone 12 between the upper limit dew point and the lower limit dew point, the moisture content in the reducing atmosphere is suitable for maintaining the brightness of the metal belt 3 and preventing SiO contained in the heat insulating material 172And (4) reducing. As a result, the metal tape 3 can be provided with glittering property, and the SiO contained in the heat insulating material 17 can be prevented from being generated2And degradation of the insulating material 17 due to the reduction.
A heat treatment apparatus 1 according to an embodiment of the present invention is a heat treatment apparatus 1 for performing bright annealing on a metal strip 3 in a reducing atmosphere, the heat treatment apparatus 1 including: a furnace body 10 having a heating zone 12 for heating the metal strip 3 and a cooling zone 14 provided on the downstream side of the heating zone 12 in the conveying direction of the metal strip 3; a heat insulating material 17, wherein the heat insulating material 17 is used as the furnace inner wall of the heating belt 12 and is made of SiO2The ceramic fiber of (2); gas supply units 9,28,28a for supplying a reducing gas into the furnace body 10; a dew point measuring unit 22 for measuring the dew point of the atmosphere in the heating zone 12; and dew point adjusting units 24,24a,27,27a,28,28a for adjusting the dew point, wherein the dew point adjusting units 24,24a,27,27a,28,28a are controlled based on the dew point measured by the dew point measuring unit 22 so that the dew point is maintained at an upper limit dew point at which the metal strip 3 can be made bright and at which the SiO contained in the heat insulating material 17 is not made2Between the lower dew points of reduction.
According to the above configuration, the dew point (i.e., the moisture content) of the atmosphere in the heating belt 12 is maintained between the upper limit dew point and the lower limit dew point, and the moisture content in the reducing atmosphere is suitable for maintaining the brightness of the metal belt 3 and preventing SiO contained in the heat insulating material 172And (4) reducing. As a result, the metal tape 3 can be provided with glittering property, and the SiO contained in the heat insulating material 17 can be prevented from being generated2And degradation of the insulating material 17 due to the reduction.
In the heat treatment apparatus 1 according to one embodiment, the control unit 20 controls the dew point adjusting units 24,27, and 28.
According to the above embodiment, automation of bright annealing (heat treatment) can be realized.
In the heat treatment apparatus 1 according to one embodiment, the upper limit dew point is-30 ℃.
According to the above embodiment, the metal strip 3 having the glittering property can be obtained.
In the heat treatment apparatus 1 according to one embodiment, the upper limit dew point is set to a range of-30 ℃ to-65 ℃ in accordance with the degree of the brightness of the metal strip 3 to be bright-annealed.
According to the above embodiment, the metal strip 3 having the required brightness can be obtained.
In the heat treatment apparatus 1 according to the embodiment, the dew point adjusting unit 24 includes at least one of a dehumidifying unit 25 and a humidifying unit 26.
According to the above embodiment, the dew point of the atmosphere in the heating zone 12 can be appropriately adjusted according to the dew point of the reducing gas supplied from the gas supply units 9,28, and 28a and the dew point of the target atmosphere.
In the heat treatment apparatus 1 according to one embodiment, the gas supply unit 9,28,28a includes a gas supply unit 9 and an adjustment valve 28,28a for adjusting the flow rate of the reducing gas supplied from the gas supply unit 9, and the gas supply unit 9 and the adjustment valve 28,28a function as the dew point adjustment unit 24,24 a.
According to the above embodiment, the dew point adjusting means 24,24a can be constituted by a simple configuration.
In the heat treatment apparatus 1 according to the embodiment, the heat treatment apparatus 1 is a horizontal furnace in which the furnace body 10 extends in the lateral direction.
According to the above embodiment, the conveying mechanism for conveying the metal strip 3 can be simplified, and the height of the heat treatment apparatus 1 can be suppressed from increasing. Further, since the ceramic fiber can be prevented from being disintegrated and the generation of dust can be prevented, the heat insulating material 17 made of lightweight ceramic fiber can be used even in a horizontal furnace having a large ceiling area.
Further, in the heat treatment apparatus 1 of an embodiment, the metal belt 3 is formed of a stainless steel material containing Cr.
According to the above embodiment, the formation of the oxide film in the metal belt 3 can be suppressed, and the metal belt 3 can be provided with the glitter.
In the heat treatment apparatus 1 according to one embodiment, the temperature of the heating belt 12 is in a range of 800 to 1250 ℃.
According to the above embodiment, the metal strip 3 may be heated at a temperature suitable for bright annealing.
In the heat treatment apparatus 1 according to one embodiment, the reducing gas includes hydrogen gas.
According to the above embodiment, the metal strip 3 may be reduced and bright annealed.
Description of the symbols
1 … … bright annealing furnace (Heat treatment equipment)
3 … … Metal Belt
5 … … gas supply line
6 … … dew point measuring pipeline
7 … … inlet side pipe
8 … … outlet side pipeline
9 … … gas supply device (gas supply part, dew point adjusting part)
10 … … furnace body
12 … … heating belt
13 … … entrance seal roller
14 … … cooling belt
15 … … outlet sealing roller
16 … … heating part
17 … … Heat insulating Material
20 … … control part
22 … … dew point measuring part
24 … … dew point adjusting device (dew point adjusting part)
24a … … dew point adjusting device (dew point adjusting part)
25 … … dehumidifier
26 … … humidifying device
27 … … first adjusting valve (dew point adjusting part)
27a … … first regulating valve (dew point adjusting part)
28 … … second control valve (gas supply part, dew point adjusting part)
28a … … second control valve (gas supply part, dew point adjusting part)
A … … represents the line at the dew point of-30 DEG C
C……Cr2O3Oxidation-reduction equilibrium curve of
S……SiO2Oxidation-reduction equilibrium curve of (a).
Claims (11)
1. The heat treatment apparatus is characterized by comprising a heating belt for heating a metal belt, a furnace inner wall used as the heating belt and made of SiO2And a gas supply unit for supplying a reducing gas to the heating belt,
so that the dew point is maintained at the upper limit dew point capable of making the metal strip bright and not making the SiO contained in the heat insulating material2The condition between the lower dew point of the reduction, bright annealing the metal strip in a reducing atmosphere.
2. A heat treatment apparatus for bright annealing a metal strip in a reducing atmosphere, the heat treatment apparatus comprising:
a furnace body having a heating belt for heating the metal belt and a cooling belt provided on a downstream side of the heating belt in a conveying direction of the metal belt;
a heat insulating material used as the inner wall of the heating belt and containing SiO2The ceramic fiber of (2);
a gas supply unit for supplying a reducing gas into the furnace body;
a dew point measuring part for measuring the dew point of the atmosphere in the heating zone; and
a dew point adjusting unit for adjusting the dew point,
controlling the dew point adjusting unit so that the dew point is maintained at an upper limit dew point at which the metal strip can be brightly formed and at which the SiO contained in the heat insulating material is not formed, based on the dew point measured by the dew point measuring unit2Between the lower dew points of reduction.
3. The heat treatment apparatus according to claim 2, wherein the dew point adjusting unit is controlled by a control unit.
4. The thermal processing device according to any one of claims 1 to 3, wherein the upper dew point is-30 ℃.
5. The heat treatment apparatus according to any one of claims 1 to 3, wherein the upper limit dew point is set within a range of-30 ℃ to-65 ℃ in accordance with a degree of brightness of the metal strip to be bright annealed.
6. The heat treatment apparatus according to any one of claims 2 to 5, wherein the dew point adjusting unit includes at least one of a dehumidifying unit and a humidifying unit.
7. The heat treatment apparatus according to any one of claims 2 to 5, wherein the gas supply unit includes: and a control valve for controlling a flow rate of the reducing gas supplied from the gas supply device, wherein the gas supply device and the control valve function as the dew point adjusting unit.
8. The heat treatment apparatus according to any one of claims 2 to 7, wherein the heat treatment apparatus is a horizontal furnace in which the furnace body extends in a lateral direction.
9. The heat treatment apparatus according to any one of claims 1 to 8, wherein the metal strip is formed of a stainless steel material containing Cr.
10. The heat treatment apparatus according to any one of claims 1 to 9, wherein the temperature of the heating belt is in a range of 800 ℃ to 1250 ℃.
11. The heat treatment apparatus according to any one of claims 1 to 10, wherein the reducing gas includes hydrogen gas.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019-222033 | 2019-12-09 | ||
| JP2019222033 | 2019-12-09 | ||
| JP2020-193632 | 2020-11-20 | ||
| JP2020193632A JP2021091960A (en) | 2019-12-09 | 2020-11-20 | Heat treatment device |
| PCT/JP2020/044346 WO2021117516A1 (en) | 2019-12-09 | 2020-11-27 | Heat treatment apparatus |
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| CN114761585A true CN114761585A (en) | 2022-07-15 |
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| JP (1) | JP2021091960A (en) |
| CN (1) | CN114761585A (en) |
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Citations (4)
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|---|---|---|---|---|
| JPH055124A (en) * | 1991-06-26 | 1993-01-14 | Nippon Steel Corp | Low dew point atmospheric heat treatment furnace |
| JPH09256074A (en) * | 1996-03-25 | 1997-09-30 | Kawasaki Steel Corp | Bright anneling method of stainless steel |
| JPH1088246A (en) * | 1996-09-10 | 1998-04-07 | Nippon Steel Corp | Continuous type bright annealing furnace of metallic strip |
| CN104053796A (en) * | 2012-01-17 | 2014-09-17 | 杰富意钢铁株式会社 | Steel strip continuous annealing furnace and continuous annealing method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS51136514A (en) * | 1975-05-22 | 1976-11-26 | Shiraishi Denki Kogyo Kk | Process and apparatus for heat treatment of metals |
| JPS62156254A (en) * | 1985-12-27 | 1987-07-11 | Nippon Kinzoku Kogyo Kk | Ferritic stainless steel hardly undergoing coloring in temper color and having superior rust resistance |
| SE515593C2 (en) * | 1999-03-01 | 2001-09-03 | Avesta Sheffield Ab | Apparatus for heating a metal band |
| JP4963043B2 (en) * | 2006-06-22 | 2012-06-27 | 新日鐵住金ステンレス株式会社 | Bright annealed ferritic stainless steel sheet with excellent rust resistance and workability and method for producing the same |
| JP4833922B2 (en) * | 2007-06-14 | 2011-12-07 | 新日本製鐵株式会社 | Continuous induction heating furnace for steel strip and method for continuous heat treatment of steel strip using the same |
| CN100567521C (en) * | 2007-12-01 | 2009-12-09 | 徐建永 | Horizontal continuous unmuffled light annealing equipment of stainless steel band |
| DE102011088633A1 (en) * | 2011-12-14 | 2013-06-20 | Ebner Industrieofenbau Gmbh | Hood furnace with positioned within a protective hood heat dissipation device, in particular fed by an oven-external energy source, for discharging heat to annealing gas |
| JP5863499B2 (en) * | 2012-02-17 | 2016-02-16 | 三菱重工業株式会社 | Heat treatment method |
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2020
- 2020-11-20 JP JP2020193632A patent/JP2021091960A/en active Pending
- 2020-11-27 WO PCT/JP2020/044346 patent/WO2021117516A1/en active Application Filing
- 2020-11-27 CN CN202080083926.5A patent/CN114761585A/en active Pending
- 2020-12-03 TW TW109142698A patent/TWI836167B/en active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055124A (en) * | 1991-06-26 | 1993-01-14 | Nippon Steel Corp | Low dew point atmospheric heat treatment furnace |
| JPH09256074A (en) * | 1996-03-25 | 1997-09-30 | Kawasaki Steel Corp | Bright anneling method of stainless steel |
| JPH1088246A (en) * | 1996-09-10 | 1998-04-07 | Nippon Steel Corp | Continuous type bright annealing furnace of metallic strip |
| CN104053796A (en) * | 2012-01-17 | 2014-09-17 | 杰富意钢铁株式会社 | Steel strip continuous annealing furnace and continuous annealing method |
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| TW202130823A (en) | 2021-08-16 |
| JP2021091960A (en) | 2021-06-17 |
| TWI836167B (en) | 2024-03-21 |
| WO2021117516A1 (en) | 2021-06-17 |
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